Legendary Lords not worth confederation?

Weird question, but it makes sense in my head. An ongoing trend with recent factions and even some older ones that have been revisited is to give powerful faction bonuses or mechanics that encourage how you'll likely build all of your armies going forward. A recent example is Elespeth's gunnery school giving all armies powerful gunpowder units that you just can't match with other Empire factions. There is also Gelt, who heavily emphasis's magic to the point that doomstacking wizards is a viable choice. If we look at the flip side, are there any LL's that are so tied to their faction bonuses that they become underwhelming if gained as a 'normal' lord through confederation without those bonuses? Where they aren't any better than a generic Lord of the same type?